FetchEventOpParent.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_dom_fetcheventopparent_h__

#define mozilla_dom_fetcheventopparent_h__

#include "nsISupports.h"

#include "mozilla/dom/FetchEventOpProxyParent.h"

#include "mozilla/dom/PFetchEventOpParent.h"

namespace mozilla::dom {

class FetchEventOpParent final : public PFetchEventOpParent {

  friend class PFetchEventOpParent;

 public:

  NS_INLINE_DECL_REFCOUNTING(FetchEventOpParent)

  FetchEventOpParent() = default;

  // Transition from the Pending state to the Started state. Returns the preload

  // response and response end args, if it has already arrived.

  std::tuple<Maybe<ParentToParentInternalResponse>, Maybe<ResponseEndArgs>>

  OnStart(

      MovingNotNull<RefPtr<FetchEventOpProxyParent>> aFetchEventOpProxyParent);

  // Transition from the Started state to the Finished state.

  void OnFinish();

 private:

  ~FetchEventOpParent() = default;

  // IPDL methods

  mozilla::ipc::IPCResult RecvPreloadResponse(

      ParentToParentInternalResponse&& aResponse);

  mozilla::ipc::IPCResult RecvPreloadResponseTiming(ResponseTiming&& aTiming);

  mozilla::ipc::IPCResult RecvPreloadResponseEnd(ResponseEndArgs&& aArgs);

  void ActorDestroy(ActorDestroyReason) override;

  struct Pending {

    Maybe<ParentToParentInternalResponse> mPreloadResponse;

    Maybe<ResponseTiming> mTiming;

    Maybe<ResponseEndArgs> mEndArgs;

};

  struct Started {

    NotNull<RefPtr<FetchEventOpProxyParent>> mFetchEventOpProxyParent;

};

  struct Finished {};

  using State = Variant<Pending, Started, Finished>;

  // Tracks the state of the fetch event.

//

  // Pending:  the fetch event is waiting in RemoteWorkerController::mPendingOps

  //           and if the preload response arrives, we have to save it.

  // Started:  the FetchEventOpProxyParent has been created, and if the preload

  //           response arrives then we should forward it.

  // Finished: the response has been propagated to the parent process, if the

  //           preload response arrives now then we simply drop it.

  State mState = AsVariant(Pending());

};

}  // namespace mozilla::dom

#endif  // mozilla_dom_fetcheventopparent_h__